Regulated magnetron power supply

ABSTRACT

A means for regulating a magnetron power supply in which a portion of the magnetron power is used to energize a lamp. As the power increases the lamp will glow brighter. A photocell senses the glow of the lamp to decrease in resistance as the lamp glows brighter. The photocell is in the circuit of the transformer primary where its changing resistance will cause a correction in the voltage being fed to the magnetron.

United States Patent Inventor Royden ll. Freeland Oklahoma City, Okla.

App]. No. 18,060

Filed Mar. 10, 1970 Patented Oct. 5, 1971 Assignee International Crystal Manulacturlng Company Oklahoma City, Okla.

REGULATED MAGNETRON POWER SUPPLY 3 Claims, I Drawing Flg.

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TRIM) 40662 26 VOLTAGE ADJUST F A l MAGNETRON References Cited UNlTED STATES PATENTS 3,414,798 12/1968 Nielsen Primary Examiner-John Kominski Attorney-Stevens, Davis, Miller & Mosher ABSTRACT: A means for regulating a magnetron power supply in which a portion of the magnetron power is used to energize a lamp. As the power increases the lamp will glow brighter. A photocell senses the glow of the lamp to decrease in resistance as the lamp glows brighter. The photocell is in the circuit of the transformer primary where its changing resistance will cause a correction in the voltage being fed to the magnetron.

REGULATION ADJUST IGILUIY PATENTED um 5:97:

, INVENTOR ROYDEN R. FREELAND Towns 20 F lllllllll lllll IIL REGULATED MAGNETRON POWER SUPPLY DISCLOSURE It is well known in the art relating to magnetrons that it is necessary for the anode voltage of the magnetron to remain substantially steady in order to obtain the proper functioning of the magnetron. The present invention has for its object to provide a means for controlling the magnetron wherein as magnetron current increases, a lamp in the magnetron circuit glows brighter and the luminescence of this lamp is detected by a photocell in the transformer primary circuit. The resistance of the photocell decreases as the lamp glows brighter and thus lowers the voltage in the transformer primary through a triac circuit.

It is another object of the present invention to provide a device which may be readily and economically produced.

The means for accomplishing the foregoing objects and other advantages, which will be apparent to those skilled in the art, are set forth in the following specification and claims and are illustrated in the accompanying drawing dealing with a basic embodiment of the present invention. Reference is made now to drawing in which the single figure is an electrical schematic of the present invention.

The magnetron itself is generally designated within the dashed block H). An input transformer 11 having a primary winding 12 and a secondary winding 13 is connected between a source of AC voltage, not shown, and the primary winding. The secondary is connected through a rectifier 14 to the magnetron and to an adjustable resistor 15 to ground. A lamp 16 is connected across the resistor 15 and is in optical relation with a photocell l7. The photocell is in a diae-triac circuit in the circuit connected to the primary of the transformer and includes a triac 18, a diac 19. a voltage adjustable resistor 20 and resistors 21, 22, 23, 24 and capacitors Z5, 26, 27, 2B and an inductance 29.

It is readily apparent from the drawing that the level at which the lamp 16 will glow is adjusted by the variable resistor 15. Also, the voltage supplied to the primary winding of the transformer can be adjusted by the adjustable resistor 20. As the magnetron current increases, the adjusted lamp [6 will glow with an increasing intensity. This increasing intensity of the lamp will be detected by the photocell 17 which in turn will decrease in its resistance thus lowering the voltage delivered to the transformer primary through the triac circuit.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore to be embraced therein.

lclaim:

l. A controlled power supply circuit for a magnetron comprising an input, a transformer the primary of which is con nected to said input, a rectifier connected to the secondary of said transformer, a lamp and said magnetron connected to said rectifier with said lamp glowing with an intensity responsive to magnetron current, photocell means in optical alignment with said lamp and which changes its resistance respon sive to the intensity of the glow of said lamp, voltage control means connected to said input and said photocell and being responsive to change in the resistance of said photocell to cor rect the voltage to said transfonner primary supplying power to said magnetron.

2. A controlled power supply circuit according to claim I further comprising means to adjust the intensity of the mag netron current at which said lamp will begin to glow.

3. A controlled power supply circuit according to claim 1 wherein said voltage control means comprises a triac-disc circuit. 

1. A controlled power supply circuit for a magnetron comprising an input, a transformer the primary of which is connected to said input, a rectifier connected to the secondary of said transformer, a lamp and said magnetron connected to said rectifier with said lamp glowing with an intensity responsive to magnetron current, photocell means in optical alignment with said lamp and which changes its resistance responsive to the intensity of the glow of said lamp, voltage control means connected to said input and said photocell and being responsive to change in the resistance of said photocell to correct the voltage to said transformer primary supplying power to said magnetron.
 2. A controlled power supply circuit according to claim 1 further comprising means to adjust the intensity of the magnetron current at which said lamp will begin to glow.
 3. A controlled power supply circuit according to claim 1 wherein said voltage control means comprises a triac-diac circuit. 